Earth's Geologic History!

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Across
  1. 4. the name for different layers of rock
  2. 6. the process responsible for the birth of our Earth
  3. 9. comparative age where geologic events are expressed as older or younger than other events
  4. 12. rock formed from cooling and solidification of molten rock/magma
  5. 14. when tectonic plates collide with one another
  6. 15. the time it takes for half of the radioactive atoms to break down into daughter atoms
  7. 17. when rock formations break and one geological feature cuts across another (ex. faults)
  8. 18. when rock layers are intruded by magma
  9. 19. rock formed from being exposed to high heat and pressure
  10. 20. massive slabs of solid rock made up of Earth's lithosphere that move slowly over time
Down
  1. 1. the process when unstable, radioactive atoms break down over time
  2. 2. Rock layers form over time horizontally but fold/tilt over time
  3. 3. when tectonic plates move away from one another
  4. 5. unstable, radioactive atoms that break down over time
  5. 7. rock formed from pre-existing rocks or pieces of once-living organisms and often have layers
  6. 8. when rock layers are eroded by wind/water but the layers stay in the same order.
  7. 10. principle where the lowest rock layer was deposited before the layers above; the youngest layers are at the top
  8. 11. when tectonic plates slide past one another
  9. 13. new, stable elements that come as a result of a parent element breaking down over time
  10. 16. age of a rock, fossil, or geologic event expressed in specific units of time (ex. years)